diff --git a/AssemblyVersion.cs b/AssemblyVersion.cs
index af89f2f..d33da70 100644
--- a/AssemblyVersion.cs
+++ b/AssemblyVersion.cs
@@ -16,5 +16,5 @@ using System.Reflection;
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("3.0.2.506")]
-[assembly: AssemblyFileVersion("3.0.2.506")]
+[assembly: AssemblyVersion("3.0.2.507")]
+[assembly: AssemblyFileVersion("3.0.2.507")]
diff --git a/Core/Users.cs b/Core/Users.cs
index 2216b7d..4b3e732 100644
--- a/Core/Users.cs
+++ b/Core/Users.cs
@@ -657,6 +657,8 @@ namespace ScrewTurn.Wiki {
 		/// </summary>
 		/// <param name="username">The username.</param>
 		public static void NotifyLogout(string username) {
+			if(string.IsNullOrEmpty(username)) return;
+
 			UserInfo user = FindUser(username);
 			if(user != null) {
 				IUsersStorageProviderV30 prov = user.Provider as IUsersStorageProviderV30;